In-line coupler



FIG. 1 is a perspective view of an in-line coupler showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom pan view thereof;

FIG. 6 is a left right side elevational view thereof, the opposite side being a mirror image of that shown; and,

FIG. 7 illustrates another perspective view thereof. 

The ornamental design for in-line coupler, as shown and described. 